{Usage: 'sml [Way] [Source]'
  {Ways ['default /repl'
    '/r /repl'          "Enter REPL(like Editor)"
    '/tree /ast'        "Display AST of parsed Source"
    '/bin <Output>'     "Cast Text-SML to Binary-SML"
    '/text <Output>'    "Cast Binary-SML to Text-SML"
    '/static <Output>'  "Calculate <Source> then save to <Output>
            Default save as Text-SML
            Can compose /bin or /text to set output style"]}
  {Examples [
    "sml /ast a.sml"
            "Display AST of './a.sml'"
    "sml /bin a.smb a.sml"
            "Make Binary-SML './a.smb' from './a.sml'"
    "sml /bin /static a.smb a.sml"
            "Calculate './a.sml' than output as Binary-SML './s.smb'"]}

